Related Experiment Video
Updated: Jul 20, 2026
![The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F54498.jpg&w=3840&q=50)
The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique
Published on: November 28, 2016
Localized and delocalized chemical bonding in the compounds CaNiGe2, SrNiGe2, and SrNiSn2
Viktor Hlukhyy1, Steffen Eck, Thomas F Fässler
1Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.
Abstract:
The new compounds CaNiGe2, SrNiGe2 and SrNiSn2 have been synthesized from the elements by arc melting techniques with subsequent annealing of the sample at 1270 K, and their structures have been determined by single-crystal X-ray diffraction methods. They crystallize in the CeNiSi2 structure (space group Cmcm). For CaNiGe2: a = 4.2213(7) A, b = 17.375(4) A, c = 4.0514(7) A, R(1) = 0.033 (all data); for SrNiGe2: a = 4.429(1) A, b = 17.420(4) A, c = 4.200(1) A, R(1) = 0.041 (all data); and for SrNiSn2: a = 4.5924(7) A, b = 18.710(3) A, c = 4.5228(6) A, R(1) = 0.021 (all data). The main structural motifs are two-dimensionally condensed Ni-centered Ge5 or Sn5 square pyramids. The crystal chemistry and chemical bonding are discussed. Analyses of the electronic structures of CaNiGe2, SrNiGe2, and SrNiSn2, with the help of the electron localization function (ELF), indicate the coexistence of localized covalent and delocalized bonding between the metal atoms involved.
More Related Videos
Related Concept Videos
Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Molecular Orbital Theory II
Hybridization of Atomic Orbitals I
Valence Bond Theory and Hybridized Orbitals
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
Ionic Bonding and Electron Transfer
Hybridization of Atomic Orbitals II

